11.) lim(f(x), x, -3) = 0, since left and right limits are equal to 0, too. Thus, d again.

12.) lim(f(x), x, -2) = -1, (c), since the left and right limits are equal to -1, too. Note that f(-2), though, is -3.

Note: Try see the bigger picture. In this case, limits help us determine whether a graph is continuous, and therefore differentiable. The function f(x) is discontinuous when either the limit of f(x) does not exist and x approaches some arbitrary x or the limit exists, though does not equal f(a), as with #12.